Species: Lobaria virens
Photos: On mature Oak trunks. Glengarrif woods, Cork, SW Ireland.
Large thallus, grey-brown when dry, 'greasy' green when wet. Overlapping, short, unridged lobes, undersides whitish, tomentose. Soralia and isidia are absent. Apothecia frequent, brown with warted margins. Asci are 8-spored, spores pale brown or colourless, 1(-3) septate, 25-45 x 8-11 Ám. Microscope photographs below.
Found in old woodland on isolated trees and also on damp, shaded coastal rocks. The most common Lobaria species in SW Ireland.
Chemical reactions usually negative but sometimes K+ faint yellow, KC+ faint pink
Similar: L. amplissima. Rare, KC+ deep pink. Apothecia occasional